US9233850B2 - Nano-scaled graphene plate films and articles - Google Patents
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Abstract
Description
- 1. K. S. Novoselov, et al., “Electric Field Effect in Atomically Thin Carbon Films,” Science 306 (2004) 666-669.
- 2. H. B. Heersche, et al., “Bipolar Supercurrent in Graphene,” Nature, 446 (March 2007) 56-59.
- 3. Y. Zhang, Y-W, Tan, H. L. Stormer and P. Kim, “Experimental Observation of the Quantum Hall Effect and Berry's Phase in Graphene,” Nature, 438 (2005) 201-204.
- 4. Y. Zhang, J. P. Small, M. E. Amori, and P. Kim, “Electric Field Modulation of Galvanomagnetic Properties of Mesoscopic Graphite,” Phys. Rev. Lett., 94 (2005) 176803.
- 5. C. Berger, et al., “Ultrathin Epitaxial Graphite: Two-dimensional Electron Gas Properties and a Route toward Graphene-based Nanoelectronics,” J. Phys. Chem. B 108 (2004) 19912-19916.
- 6. G. H. Chen, W. Weng, D. Wu, C. Wu, J. Lu, P. Wang, X. Chen, “Preparation and Characterization of Graphite Nanosheets from Ultrasonic Powdering Technique,” Carbon, 42 (2004) 753-759.
- 7. H. Fukushima and L. T. Drzal, “Graphite Nanoplatelets As Reinforcements for Polymers: Structural and Electrical Properties,” Proc. Of the 17th Annual Conf. of the Am. Soc. For Composites, Purdue University, (2003).
- 8. H. Fukushima, S. H. Lee, and L. T. Drzal, “Graphite Platelet/Nylon Nanocomposites,” Proc. of SPE ANTEC (2004) 1441-1445.
- 9. W. Zheng, et al, “Transport Behavior of PMMA/Expanded Graphite Nanocomposites,” Polymer, 73 (2002) 6767-6773.
- 10. A. Yasmin and I. M. Daniel, “Mechanical and Thermal Properties of Graphite Platelet/Epoxy Composites,” Polymer, 45 (2004) 8211-8219.
- (1) At a thickness of approximately 105 μm, the thermal conductivity of an NGP non-woven mat is 580 W/(mK), much higher than 140-190 W/(mK), the values commonly associated with commercially available flexible graphite.
- (2) With fully separated, ultra-thin flakes or NGPs, we can obtain a non-woven mat of platelets much thinner than 100 μm (the practical lower limit of flexible graphite thickness). A sample as thinner than 100 nm can be readily obtained. Such a thin, well-packed NGP aggregate exhibits an exceptionally high thermal conductivity of approximately 2,000 W/(mK).
- (3) Resin impregnation of the non-woven mat slightly increases the thermal conductivity. Chemical vapor infiltration of the NGP mat with pyrolytic graphite increases the thermal conductivity to a much greater extent. Surprisingly high thermal conductivity values were observed with the NGP mat densified with pyrolytic graphite; values as high as 4-5 times the conductivity of pure copper.
- (1) At a thickness of approximately 105 μm, the electrical conductivity of an NGP non-woven mat is 3,450 S/cm, much higher than 1,100 S/cm, the values commonly associated with commercially available flexible graphite.
- (2) An NGP-based non-woven mat 90 nm thick exhibits an in-plane electrical conductivity of approximately 6,540 S/cm.
- (3) Resin impregnation of the non-woven mat appears to slightly decrease the thermal conductivity. Chemical vapor infiltration of the NGP mat with pyrolytic graphite significantly increases the electrical conductivity. Also quite surprisingly, very high electrical conductivity values (10,000-29,500 S/cm) were observed with the NGP mat densified with pyrolytic graphite.
Claims (35)
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US9957164B2 (en) | 2014-04-03 | 2018-05-01 | Nanotek Instruments, Inc. | Highly conducting graphitic films from graphene liquid crystals |
US9988273B2 (en) | 2016-08-18 | 2018-06-05 | Nanotek Instruments, Inc. | Process for producing highly oriented humic acid films and highly conducting graphitic films derived therefrom |
US10003078B2 (en) | 2016-09-20 | 2018-06-19 | Nanotek Instruments, Inc. | Metal-sulfur battery cathode containing humic acid-derived conductive foam impregnated with sulfur or sulfide |
US10014519B2 (en) | 2016-08-22 | 2018-07-03 | Nanotek Instruments, Inc. | Process for producing humic acid-bonded metal foil film current collector |
US20190029141A1 (en) * | 2017-07-21 | 2019-01-24 | Raytheon Company | Reduced cost and schedule manufacturing of graphene paper based thermal straps/harnesses |
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US10566482B2 (en) | 2013-01-31 | 2020-02-18 | Global Graphene Group, Inc. | Inorganic coating-protected unitary graphene material for concentrated photovoltaic applications |
US10584216B2 (en) | 2016-08-30 | 2020-03-10 | Global Graphene Group, Inc. | Process for producing humic acid-derived conductive foams |
US10593932B2 (en) | 2016-09-20 | 2020-03-17 | Global Graphene Group, Inc. | Process for metal-sulfur battery cathode containing humic acid-derived conductive foam |
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